/**
AirwayPathfinder for X-Plane Flight Simulator. Calculates the shortest path between two NavAids. 
Copyright (C) 2011  Nils Buletta

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 **/

package de.buletta.airwaypathfinder;

import java.awt.event.MouseWheelEvent;
import java.awt.event.MouseWheelListener;

/**
 * Listens for mouse wheel events on the map.
 * 
 * @author Nils Buletta
 * 
 */
public class MapMouseWheelListener implements MouseWheelListener {
	private Gui g;

	public MapMouseWheelListener(Gui g) {
		this.g = g;
	}

	/**
	 * If the mouse wheel was used to zoom into the map, recenter the map to the
	 * mouse cursor position.
	 */
	@Override
	public void mouseWheelMoved(MouseWheelEvent evt) {
		if (evt.getWheelRotation() < 0) {
			// get the position of the mouse cursor and set as the new address
			// location
			g.mapKit.getMainMap().setAddressLocation(
					g.mapKit.getMainMap().convertPointToGeoPosition(
							evt.getPoint()));
			g.mapKit.getMainMap().recenterToAddressLocation();
		}
	}
}